JavaScript is very possible to use in Facebook applications. A book about FBML would not be complete without at least a short introduction to FBJS. I’m going to keep this discussion “in a nutshell,” but you can find much more information on the Facebook Developer Wiki at http://wiki.developers.facebook.com/index.php/FBJS.
FBJS is a very limited form of JavaScript, which Facebook has placed controls on to prevent malicious code in applications from accessing data it shouldn’t. Privacy is of the utmost importance on Facebook, and FBJS controls reflect that. Despite the restrictions, with a little practice, FBJS can provide almost all necessary functions that JavaScript can provide in an external application.
For even more flexibility in a JavaScript-heavy site, you should take some time and look up the JavaScript Client Library on the Facebook Developer Wiki: http://wiki.developers.facebook.com/index.php/JavaScript_Client_Library.
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